TM-9-2320-280-34
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1996
TM-9-2320-280-34 - Page 904 of 1258
TM 9-2320-280-34
1 7 - 1 1 8
Change 1
1 7 - 2 8 . CONTROL VA LVE AND A C C U M U L ATOR HOUSING REPAIR (4L80-E)
INITIAL SETUP:
Applicable Models
M997A2, M1025A2, M1035A2,
M1043A2, M1045A2, M1097A2, M1123
Tools
General mechanic’s tool kit:
automotive (Appendix G, Item 1)
Materials/Parts
Gasket set kit (Appendix E, Item 43)
Seal (Appendix E, Item 156)
Two seals (Appendix E, Item 157)
O-ring (Appendix E, Item 109)
Petrolatum (Appendix B, Item 38)
Manual References
TM 9-2320-280-24P
Equipment Condition
Transmission disassembled into
subassemblies (para. 17-14).
Maintenance Level
General support
This task covers:
a.
Accumulator Housing Cleaning
e.
Control Valve Inspection
b.
Accumulator Housing Disassembly
f.
Control Valve Assembly
c.
Control Valve Disassembly
g.
Accumulator Housing Inspection
d.
Control Valve Cleaning
h.
Accumulator Housing Assembly
1.
Remove six capscrews (1) from accumulator housing (2) and control valve assembly (8).
2.
Remove accumulator housing (2), gasket (4), and springs (3) and (9) from control valve
assembly (8). Discard gasket (4).
3.
Remove gasket (5), spacer plate (6), and gasket (7) from control valve assembly (8). Discard
gaskets (7) and (5).
4.
Remove snapring (10) from pin (16) on the outside housing, and remove fourth clutch piston
assembly (15) from housing (2).
NOT E
Perform step 5 for 1995-1996 transmissions only.
5.
Remove snapring (17) and pin (16) from fourth clutch piston (15).
6.
Remove seal (14) from fourth clutch piston (15). Discard seal (14).
7.
Remove third clutch piston (12) from housing (2).
8.
Remove seals (11) and (13) from third clutch piston (12). Discard seals (11) and (13).
b. Accumulator Housing Disassembly
a. Accumulator Housing Cleaning
1.
Clean control valve assembly (8) and accumulator housing (2) thoroughly in solvent.
2.
Air dry control valve assembly (8).
CAUTION
Do not use a honing stone, fine sandpaper, or crocus cloth to clean
a valve. Use micro fine lapping compound 900 grit (J384-59).
NOT E
Work area should be well-ventilated, clean, and free from blowing
dirt and dust.
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